<?php
session_start();
if (isset($_SESSION['Usuario'])) {
  header('location:admin.phtml');
}
?>
<form action="inc/login.php" method="POST">
  <label>Email</label>
  <input type="email" name="email" />
  <label>Senha</label>
  <input type="password" name="senha" />
  <input type="submit" value="Login" />
</form>